LeetCode – 290. Word Pattern
Given a pattern and a string str, find if str follows the same pattern. Here follow means a full mat…
LeetCode – 246. Strobogrammatic Number
A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside …
LeetCode – 242. Valid Anagram
Given two strings s and t, write a function to determine if t is an anagram of s. For example, s = &…
LeetCode – 186. Reverse Words in a String II
Given an input string, reverse the string word by word. A word is defined as a sequence of non-space…
LeetCode – 189. Rotate Array
Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array …
LeetCode – 125. Valid Palindrome
Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignori…
LeetCode – 66. Plus One
Given a non-negative integer represented as a non-empty array of digits, plus one to the integer. Yo…
LeetCode – 58. Length of Last Word
Given a string s consists of upper/lower-case alphabets and empty space characters ‘ ‘, return the l…
LeetCode – 20. Valid Parentheses
Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the inpu…
LeetCode – 14. Longest Common Prefix
Write a function to find the longest common prefix string amongst an array of strings. 没啥难度，不多说了 pub…